Tooth mounting on blade of earth moving implement



y 1, 1958 E. w. HAZZARD ETAL 2,840,934

TOOTH MOUNTING 0N BLADE OF EARTH MOVING IMPLEMENT I Filed Sept. 7, 1954 0, C) FIG?! 0 I W H \KW I i... i... 7 F|G.3

INVENTOR.

ELMER W. HAZZARD BY JOHN K. MCLEOD WWW A TTORNEKS TOOTH MOUNTING N BLADE OF EARTH MOVING IMPLEMENT Elmer W. Hazzard and John K. McLeod, Coos Bay, Oreg.

Application September 7, 1954, Serial No. 454,278

3 Claims. (Cl. 37-145) The present invention relates to earth moving implements and more particularly to the mounting of teeth on the blade or moldboard of an earth moving implement.

To facilitate certain digging operations, and also to protect the blade or moldboard of earth moving apparatus such as bulldozers, it is the customary practice to mount a tooth at each of the lower, opposite corners of the moldboard. However, such a tooth will become worn and must be replaced if used continually in rocky ground, and also in many operations it is not desired that the tooth be present. Hence, acorner tooth must be readily removable or attachable as the necessity requires.

It is an object of the present invention to provide a new and improved arrangement for detachably securing a tooth to the corner of a moldboard or blade of an earth working implement.

More particularly, it is an object to provide an arrangement whereby a corner tooth may be easily and quickly attached or removed from a blade or moldboard.

It is a further object to provide an inexpensive arrangement for removably mounting a corner tooth upon a bulldozer blade.

Other objects and advantages of the invention will become more apparent hereinafter.

Briefly stated, in accordance with the present invention a corner tooth is mounted on a bulldozer blade or moldboard by clamping the tooth between the moldboard and an overlying end bit secured to the face of the moldboard,-the end bit being provided with an offset portion defining with the moldboard a socket for receiving the shank of the tooth.

For a more detailed description of the invention, reference is made to the accompanying drawings and the following description thereof.

In the drawings,

Fig. 1 is a fragmentary front elevation of an earth moving blade or moldboard showing a tooth mounted thereon in accordance with the present invention;

Fig. 2 is a plan view of an end bit in accordance with the present invention;

Fig. 3 is a bottom view of the bit shown in Fig. 2;

Fig. 4 is a sectional view taken along line 4-4of Fig. 1;

14 which extend slightly below the bottom edge of the moldboard. The endmost plates, of which only one is shown and indicated by the numeral 15, are ordinarily nited States Patent "ice termed corner or end bits. The wear plates, including the end bits 15, are shaped so as to fit generally flush and snugly against the front face of the moldboard and are removably secured thereto by suitable means such as bolts indicated at 16.

In accordance with the present invention, the end bit 15 is formed with a medially disposed, offset portion 17 which defines with the moldboard face an elongate socket 18 extending generally upwardly from the bottom edge of the moldboard and inwardly from the adjacent side edge of the moldboard. The socket 18 is adapted to receive the shank portion 19 of a corner tooth 20 having a working portion extending downwardly and outwardly from the moldboard 10, as shown in Fig. 1. In the embodiment of the invention shown in Figs. 1 to 5, the end bit is offset so as to provide, when mounted on the moldboard, a socket of substantially uniform, rectagnular cross section throughout its length. The tooth shank 19 has a width substantially equal to that of the socket 18, but preferably has a thickness slightly greater than the height of the channel defined by the offset portion 17 for a purpose to be explained.

To secure the tooth 20 to the moldboard 10, the end bit 15 is mounted loosely on the face of the moldboard,

the tooth shank 19 is inserted within the socket 18 and bolts 16 are inserted and tightened. Since the tooth shank is of slightly greater thickness than the height of the ofiset portion 17, the tightening of the bolts 16 will cause the tooth shank to be tightly clamped between the end bit and the moldboard as indicated in Fig. 4. Suitable means, such as additional bolts 21 extending through the end bit 15, the tooth shank 19 and the moldboard 10, may be provided securely to hold the tooth shank within the socket 18.

In accordance with an alternative arrangement, the end bit is formed with an offset portion, but which in this instance is shaped so as to provide a converging socket. With reference to Figs. 6 and 7, there is shown an end bit 25 having an offset portion 26 which is of progressively decreasing width and height upwardly and inwardly from the lower edge of the bit whereby to define with the moldboard 10 a tapering socket, in which is received a cooperatively tapered shank 27 of a corner tooth 28. The tapered configuration may be desirable in some instances so that the thrust imposed on the tooth 28 will be imposed upon the tapering walls of the socket.

As will be obvious, an end bit as shown may be inexpensively manufactured and a corner tooth may be easily and quickly attached or removed from a moldboard with the arrangement shown.

Having illustrated and described preferred embodiments of the invention, it should be apparent to those skilled in the art that the invention permits of modification in arrangement and detail. We claim as our invention all such modifications as come within the true spirit and scope of the appended claims.

We claim:

1. In combination, an earth digging implement moldboard having a front face, a bottom edge and an intersecting side edge, an end bit secured to the front face of said moldboard adjacent the corner defined by said intersecting edges and extending below said bottom edge, said end bit being generally flush with said moldboard face but having an elongate medial portion offset from said face and extending upwardly from said bottom edge and inwardly relative to said side edge to define with said moldboard face a socket, a corner tooth having a shank cooperatively fitting within said socket, said tooth extending angularly downwardly below the bottom edge of said end bit, and means extending through said end bit, tooth shank and moldboard for securing said tooth in place.

2. In combination with a bulldozer moldboard, an end bit shaped to fit generally against and secured to the forward surface of said moldboard at a lower corner thereof, a plurality of bolts extending through said end bit and moldboard for securing said end bit to said moldboard, said end bit having a portion offset from said moldboard forward surface to define therewith a socket of rectangular outline in transverse cross section extending upwardly of said moldboard from said lower corner thereof, and a tooth having a rectangular shank extending into said socket, said shank having a width substantially equal to that of said socket and a thickness Slightly greater than the height of said ofiset portion whereby said tooth shank may be clamped tightly between said end bit and said moldboard by tightening of said bolts.

3. The combination as set forth in claim 1 wherein said end bit portion is shaped to define a socket inclined and converging upwardly and inwardly of said moldboard face from said corner.

References Cited in the file of this patent UNITED STATES PATENTS 967,819 McKenzie Aug. 16, 1910 2,092,311 Hosmeret al Sept. 7, 1937 2,584,868 Guess Feb. 5, 1952 2,612,280 Stueland Sept. 30, 1952 FOREIGN PATENTS 82,621 Sweden Feb. 19, 1935 

